If you riffle shuffle a deck of cards and ask your spectator to stop you at any point, you can separate the deck, offer the lower half to the spectator so they can remove the top card, and you can glimpse the bottom card of the upper half. Spotting this card will tell you the suit and number of the card selected by the spectator. If the card you spotted was a Six of Hearts, you'll instantly know that the spectators card is the Jack (knave) of Spades. (Knave is an old word of Knight).

This method will serve you well if you take the time to commit it to memory.

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